In the natural world, survival of the fittest motivates foxes, frogs, and bears to stay healthy or else become food for winged sharks. Because modern conveniences such as cars and online dating naturally demotivate humans from fitness, today’s Groupon will marshal your muscles back into shape. For $25, you get five hour-long drop-in boot-camp classes at Hi Def Bodies (a $75 value). Redeem your Groupon during the first session and you'll receive a punch card good for four more classes. Boot camp is offered at 6 a.m. Monday, Wednesday, and Friday; 7 p.m. Monday and Friday; and 8 p.m. Wednesday. Once winter ends, the boot camp heads outdoors.

When most people hear the words "boot camp," they immediately think of the grueling pain and constant verbal abuse suffered during the summer camp where they were forced to make boots. Fitness boot camps are much more fun—and a great deal of the fun of Hi Def's boot camp is that it keeps the body guessing. Personal trainer Tommy Middleton might hold class indoors or among the Oklahoma's great outdoors, and will incorporate cardio drills, short-distance running, lunges, core exercises, jumping rope, obstacle courses, circuit training, yoga, and a few surprises. Make no mistake—it's hard work, but fellow classmates of every age and athletic level will keep you motivated with their upbeat attitudes and puppetry skills.

Tommy Middleton has nine years of personal training experience and is certified in strength training, primary nutrition, functional fitness, first aid, and CPR, among other things, so he'll teach you how to safely blast your bod without busting it. Tommy will also use verbal motivation to challenge you to top yourself, such as "Toss me that boulder, would ya?" and "Please put your top back on, ma'am." And if Tommy catches you slacking, he'll throw together a friendly group competition. A full boot camp at Hi-Def lasts six weeks, but expect to see improvements in strength, endurance, flexibility, and mood by the time you reach the end of your punch card.

Your Groupon is not valid with Hi Def Bodies' offer for a free first class.

Reviews

Boot campers from Hi Def Bodies are locked in heated competitions with their hi-def televisions to see who's the most high-deffest, but a few managed to write some shimmering testimonials:

• I had my cholesterol rechecked yesterday and my bad cholesterol had dropped 39 points in 90 days. I told my doctor about boot camp and he said that is probably what brought it down. I only have 11 points to go and it will be normal…I love the way I feel and my family thanks you for helping me get healthy. – Annette Watson
• Five weeks ago I stated [sic] this boot-camp, and in that short time I can now raise arm over my head. Even more, I feel strong and WOW I can already see the difference in my appearance!…I encourage everyone to participate in this camp. For me it was the difference between life and death. – Customer Testimonial
• I believe I was the oldest one in the class, but kept up pretty good. (I'm early 50's)…The six weeks is over and I have never felt better…I plan on going to another six week session. Sure, it was BOOT CAMP, but we had fun. I challenge people to come at least once and you will know what I'm talking about. You will feel great too. – Berta